There's a huge difference between mortality of childbirth and psychological trauma. The later does not seem to have significant enough research to support your

There's a huge difference between mortality of childbirth and psychological trauma. The later does not seem to have significant enough research to support your point of view. I found a few papers, and they all seem to suffer from small samples sizes (under 100) and methodological issues (measure cognitive skills, and only use income as a confounder, rather than parent's cognitive skills, which are highly hereditary).